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Abstract: Flexural strength of engineering ceramics is sensitive to
the micro-cracks and residual stresses induced during the machining
processes. Surface integrity plays an extremely important role in the
unexpected fracture of ceramic parts and their reliability in service.
Flexural strength is introduced for evaluating the surface integrity of
engineering ceramic surfaces. The distributions of the strength data are
further analyzed by the Weibull statistical method to give a
quantitative measure. Test results show that the electro-discharge
machining has a damaging effect on the surfaces of Syalon501 ceramics,
giving low flexural strength and low Weibull modulus. Micro-plastic
deformation plays an important role for obtaining good surface integrity
in the surface modification processes.
Key words: Engineering ceramics Wire electro-discharge machining
Micro-plastic deformation
CLC No: TQ174
国家自然科学基金(50075048)和教育部高等学校重点实验室访问学者基金资助项目. Received 20020830, received
in revised form 20021010
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